Pioneer vsx 24 tx service manual

Page 1

Pioneer

Service
Manual

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

VSX-29T
VSX-27TX
VSX-26TX
VSX-24TX
VSX-D908S

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

ORDER NO.
RRV2133

Model
Type Power Requirement Remarks
VSX-29TX VSX-27TX VSX-26TX VSX-24TX VSX-DSDBS
KU/CA Q Q Q Q Q AC120V

CONTENTS

1. SAFETY INFORMATION ---------------------------- 7. GENERAL INFORMATION -- 84
2. EXPLODED VIEWS AND PARTS LIST ----- -- 3 7.1 DISASSEMBLY ---------------- -- 84
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 10 7.2 PARTS ------ -- 86
4_ PCB CONNECTION DIAGRAM ......................... 48 7_2_1 IC ........ __ 86
5 PCB PARTS L|ST---- ..... 71 7_ 2 2 DISPLAY ............................ .. 90
6. ADJUSTMENT -------------- 83 7 3 REMOTE CONTROL UNIT ----- - -92

8 PANEL FACILITIES AND SPECIFICATIONS ----- 103

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, MegurO-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE, INC. P.O. BOX1760, Long Beach, CA 90801-1760, U.S.A.

PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 MelseIe, Belgium

PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

©P|ONEER ELECTRONIC CORPORATION 1999
T- IZK MAY 1999 Printed in Japan

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VSX-29TX, VSX-27TX, VSX-26TX,
VSX-24TX, VSX-D908S

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians ; it is not meant for the casual do-it-
yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained
to properly and safely repair complex products such as those covered by this manual.

improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you

should not risk trying to do so and refer the repair to a qualified service technician.

WARNING

This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause

cancer, birth defects or other reproductive harm.

NOTICE
(FOR CANADIAN MODEL ONLY)

Health & Safety Code Section 25249.6 - Proposition 65

Fuse symbols -EE- (fast operating fuse) and/or {EE- (slow operating fuse) on PCB indicate that replacement parts must

be of identical designation.

REMARQUE .
(POUR MODELE CANADIEN SEULEMENT)

Les symboles de fusible -EE- (fusible de type rapide) et/ou -EE- (fusible de type lent) sur CCI indiquent que les pieces

de remplacement doivent avoir Ia meme designation.

_ (FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
such as Simpson Model 229-2 or equivalent between the
earth ground and all exposed metal parts of the appliance
(input/output terminals, screwheads, metal overlays, control
shaft, etc). Plug the AC line cord of the appliance directly
into a 120V AC GOHZ outlet and turn the AC power switch
on. Any current measured must not exceed 0.5mA.

0 Reading should
Leakage not be above

Device current 0.5mA
under tester
test =I _I+
Test all
exposed metal
surfaces
%
® Also test with
plug reversed ? Earth
(Using AC adapter ground

plug as required)

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this Service Manual.

Electrical components having such features are identified
by marking with a A on the schematics and on the parts list
in this Service Manual.

The use of a substitute replacement component which does
not have the same safety characteristics as the PIONEER
recommended replacement one, shown in the parts list in
this Service Manual, may create shock, fire, or other hazards.

Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.